Casting method of large nodular cast iron movable template

The invention discloses a casting method of a large nodular cast iron movable template. The large nodular cast iron movable mold plate is produced by adopting a segmented evanescent mode combination method, the number of outer molds and core boxes is greatly reduced, the adverse effect on a casting caused by using a chaplet during core assembly is avoided, the modeling difficulty is reduced, and the size error formed by manual modeling is reduced; the reinforced wood molds are arranged on the pressed side faces and the bottom of the lost foam sample, a plurality of round steel is inserted into the lost foam sample, the strength of the lost foam sample is improved from two aspects, the method is reasonable in design and high in casting precision, and the defect that in traditional casting of large nodular cast iron, lost foam is insufficient in strength and is extruded to deform can be overcome; casting matrix iron liquid is subjected to combination of spheroidizing inoculation and multi-stage inoculation, the